Frederick k



(No Model.)

P. K. FITCH;

ELECTRIC ARC LAMP.

No. 292,293. Patented Jan. 22, 188 1.

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ELECTRIC-ARC LAMP.

S'PECIFICA'IIOII fern-lin part of Letters Patent No. 292,293, dated January 22, 1884,

Application filed May 16, 1883. (No model.)

To aZZ whom, it 71mg concern/.-

Be it known that I, FREDERICK R. Fircir, of New York, in the county of Xew York and State of Xew York, have invented certain new and useful Improvements in Electric Are Lamps; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, in which Figure 1 is a front elevation of my improvement. Fig. 2 is an elevation at right angles to Fig. 1, with magnet K removed. Fig. 3 is plan view, and Fi 4 a detached plan of clutch.

This invention relates to electric-arc lamps; and it consists in the construction and combination of devices, hereinafter fully described and claimed.

My present improvements have reference to that class of arclamps in which the arc is established by a helix or electro-magnet in the main circuit of the lamp acting upon the upper-carbon holder through the medium of a clutch or gripping device.

In the drawings, A designates the bracket or plate which sustains the actuating mechanism, and B the earbon-hol ding rod passing therethrough and carrying the positive carbon at its lower end.

At one side of the rod 13 are the twin electro-magnets C C,whose upper and lower polar extensions, a a, converge to form a common pole. The main or lighting current passes through the coils of magnets G O in multiple arc, and in such directions as to make the polarity of the two alike at the top and alike at the bottom. A standard, b, rises between the magnets G from plate A, and in this is journaled a Z-armaturc, D, oscillating in a vertical plane.

Contrary to the usual mode of setting such armatures, I set the armature D so that in its normal or unattractcd position the circular extensions will be farthest from the respective poles of the electromagnets O 0, and the cross bar or body will be nearest the said poles. Such position normally will be assured by the retractile spring 0, as shown in the drawings. The object of this setting of the armaturel) in an apparently reversed position is to secure the strongest attraction at the initial movement-of the armature, which attraction bc comes less strong as the movement progresses, and consequently when the are is fully established the magnets G are in a condition to most quickly respond to a weakening or fall of current.

Attached to one edge (the rear edge with respect to the attracted movement) of armature D is a crank-arm. d, as shown, pivoted to a link, 0, which extends) up and is pivoted to one end of the clutch f, which surrounds the rod B, and whose other end is supported on the pin or table g, projecting from standard I), said table gbcing adj ustable, if desired. The clutch f is annular and formed of a split plate having hole h (see Fig. a) for the red I and having the end farthest from the link 0 open or slotted to form the forks 1 as shown. The other end of the clutch f is thinned, so that a moderate force applied between the forks i will spread the clutch and free it from the rod 13. Vhen magnets (l are energized, armature D is attracted, crank-arm d rises, and, by means of link 6, lifts the adjacent end of clutch f, which in turn binds upon and elevates rod 13, thus striking thearc.

Facing the armature D, I place the reversed electro-magnet K, having a plain or Z-shaped oscillating armature, L, journaled horizontally, as shown, and oscillating in a vertical plane. Magnets 1C are wound with line wire for high resistance, and are placed in derived circuit between the lamp-terminals and around the are. The horizontal shaft m carries at its end the upright linger n, rigidly attached thereto, and having forks 0 at its upper end.

Between the forks i of the clutchf, I journal a cam, 12, in any suitable manner, having the lever q, rigidly extending therefrom and pass ing between the forks 0 ot'iinger '12.

A retractile spring, '2', is arranged to hold the armature Ii nori'nally in an unattracted position, such that the oscillating fingers will hold the cam p just free from exerting an expanding effort upon the clutch-forks i, and said spring will be so adjusted as to yield to the attraction of magnet IQ for its armature Ii only after a predetermined length of are has been exceeded, thereby throwing more current into said magnet Ii. \Yhcn such takes place, the finger a causeslcvcr q to move hori zontally and turn the cam p, thus forcibly til ICO

separating the forks i of clutch f, which thus releases its grip on the rod B more or less, and. allows it to descend, such descent being checked by the cam 19 relievingits pressure on the forks i as soon as the lessened resistance of the arc sufficiently curtails the amount of current actuating the magnet K.

I claim as my invention 1. In an electric-arc lamp, a split annular clutch, f, adapted to normally grip and lift the carbon rod when tilted, in combination with suitable means adapted to spread the split clutch and release said rod, substantially as described.

2. In an electric-arclamp, the combination, with a split annular clutch, adapted by tilting to grip and lift the carbon rod, of an electromagnetic device in the arc-circuit operating to elevate said clutch, and an electro-maguetic device in a derived circuit around the arc opl crating to spread the clutch and release the carbon rod, substantially as described.

3. In an electric-arc lamp, the combination of the rod B, clutch f, link 0, arm d, oscillating armature D, and spring 0, substantially as described.

4. In an electric-arc lamp, the combination, with the clutch f, adapted to grip and lift the carbon rod, and having forks i, of the derivation-magnet K, armature L, shaft in, finger it, having forks 0, cam p, having lever q, and spring 1*, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

FREDERICK K. FITCH.

\Vitnesses:

T. J. PATTERSON, A. V. I). WaTTERsoX. 

